自定義多任務的Timer,任務按指定間隔時間,順序執行

需求如下:在做demo的時候,彈出dialog,需要定時先后執行修改ui的動作.

譬如:

第一次 間隔 2s msg:正在下載

第二次 間隔 2s msg:下載完成,開始安裝

第三次 間隔 2s msg:安裝完成

第四次 間隔 1s 關閉dialog.

自定義Timer類如下:

 

public class CustomTimer extends Timer {
  List<Task> taskList = new ArrayList<Task>();

  public CustomTimer addTask(Task task) {
   int index = taskList.size();
   taskList.add(task);
   if (index > 0) {
    taskList.get(index - 1).setNextTask(task);
   }
   return this;
  }

  public void start() {
   if (taskList.size() > 0) {
    sched(this, taskList.get(0));
   }
  }

  private CustomTimer sched(final CustomTimer currentCustomTimer,
    final Task currenttask) {
   final CustomTimer next = new DialogTool().new CustomTimer();
   currentCustomTimer.schedule(new TimerTask() {
    @Override
    public void run() {
     currenttask.run();
     if (currenttask.getNextTask() != null) {
      sched(next, currenttask.getNextTask());
     }
    }
   }, currenttask.getDelay());
   return currentCustomTimer;
  }

  public abstract class Task {
   private Task nextTask;

   public abstract void run();

   public abstract long getDelay();

   public Task getNextTask() {
    return nextTask;
   };

   public void setNextTask(Task next) {
    this.nextTask = next;
   }
  }
 }
//用法如下:

public static void showProgressDialog2(Context context, String title,
   String msg, boolean cancelable, final long runtime, int iconId,
   final String title2, final String msg2, final long closetime) {
  final ProgressDialog mypDialog = new ProgressDialog(context);
  mypDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); //
  // 设置ProgressDialog 标题
  mypDialog.setTitle(title); // 设置ProgressDialog 提示信息
  mypDialog.setMessage(msg); // 设置ProgressDialog 标题图标
  mypDialog.setIcon(iconId); // 设置ProgressDialog 的进度条是否不明确
  mypDialog.setIndeterminate(false); // 设置ProgressDialog 是否可以按退回按键取消
  mypDialog.setCancelable(cancelable); // 让ProgressDialog 显示
  mypDialog.show();
  // final Handler currentHandler = new
  // EHandler(Looper.getMainLooper(),mypDialog);
  final Activity activity = (Activity) context;

  // new Timer().schedule(new TimerTask() {
  // @Override
  // public void run() {
  // // Message msg= currentHandler.obtainMessage(1,1,1,msg2);
  // // currentHandler.sendMessage(msg);
  // // 試試用runOnUiThread方法
  // activity.runOnUiThread(new Runnable() {// 對UI的操作放在uiThread里面
  // public void run() {
  // mypDialog.setMessage(msg2);
  // mypDialog.setTitle(title2);
  // };
  // });
  // new Timer().schedule(new TimerTask() {
  // @Override
  // public void run() {
  // mypDialog.dismiss();
  // }
  // }, closetime);
  // }
  // }, runtime);
  // test...
  DialogTool dt = new DialogTool();
  CustomTimer ct = dt.new CustomTimer();
  dt.new CustomTimer().addTask(ct.new Task() {
   @Override
   public long getDelay() {
    return runtime;
   }

   @Override
   public void run() {
    activity.runOnUiThread(new Runnable() {
     public void run() {
      mypDialog.setMessage(msg2);
      mypDialog.setTitle(title2);
     }

    });

   }
  }).addTask(ct.new Task() {
   @Override
   public long getDelay() {
    return runtime;
   }

   @Override
   public void run() {
    activity.runOnUiThread(new Runnable() {
     public void run() {
      mypDialog.setMessage("third message");
      mypDialog.setTitle("third title");
     }

    });

   }
  }).addTask(ct.new Task() {

   @Override
   public long getDelay() {
    return closetime;
   }

   @Override
   public void run() {
    mypDialog.dismiss();
   }

  }).start();

 }